The **M2REB-R4D-R/N** belongs to a specific category of industrial computing hardware, typically associated with **IEI Integration Corp**. This part number refers to a specialized **Riser Card** or an expansion module used primarily in embedded systems and rackmount chassis. --- ### 1. Component Overview A Riser Card is an electronic component used to extend or change the orientation of expansion slots (like PCIe or PCI) on a motherboard. This allows for the installation of full-sized expansion cards in low-profile or space-constrained enclosures. | Attribute | Specification Details | | :--- | :--- | | **Manufacturer** | IEI Integration Corp | | **Type** | Riser Card / Expansion Module | | **Primary Interface** | Typically PCIe (Peripheral Component Interconnect Express) | | **Form Factor** | Proprietary/Specific to compatible IEI Chassis | | **Orientation** | Usually Right-Angle or Butterfly (depending on suffix) | --- ### 2. Breakdown of the Model String While specific internal datasheets are often required for precise pinouts, the nomenclature generally follows this logic: * **M2REB**: The series designation (likely referring to M.2 or specialized Backplane/Riser architecture). * **R4D**: Indicates the lane configuration or the physical layout (e.g., 4 slots or 4-lane PCIe support). * **R/N**: Often denotes a revision or a specific configuration regarding "Right" orientation or "Normal" signaling. --- ### 3. Key Electronic Functions The M2REB-R4D-R/N serves several critical electrical purposes: 1. **Signal Redirection:** It acts as a bridge, routing high-speed differential signals from the motherboard's horizontal plane to a vertical or angled plane. 2. **Power Distribution:** It passes standard voltages (3.3V, 5V, 12V) from the main bus to the peripheral card. 3. **Impedance Matching:** The PCB is designed with specific trace widths and spacing to maintain the 100-ohm differential impedance required for high-speed data integrity. 4. **Decoupling Capacitors:** Usually features small SMD capacitors to filter high-frequency noise from the power rails to ensure stable card operation. --- ### 4. Common Application Scenarios * **1U/2U Rackmount Servers:** To fit a GPU or Network Card horizontally because the case is too short for vertical installation. * **Industrial Automation:** Connecting specialized I/O cards to compact embedded PCs. * **Storage Expansion:** Providing additional lanes for NVMe or RAID controller cards. ---